Abstract: A method and system for planning and booking a trip, voyage or other travel service or product by using a social network on a network.

Abstract: The invention relates to a security method for a computer system comprising a server part (1), which is equipped with at least one server (3), and a client part (2) which is provided with at least one client terminal (4) by means of which a client can access the system by specifying a session name. The invention also relates to a device for using said method. According to the invention, the following steps are carried out: creation of a gateway device (5) in the server part (1), said gateway device communicating with the server (3); creation of a proximity device (6) in the physical vicinity of each client terminal (4), said proximity device communicating with the client terminal (4) and the gateway device (5); communication between the server (3) and the client terminal (4) by means of gateway (5) and proximity (6) interface devices; encryption of all or part of the transmission between the gateway device (5) and the proximity interface device (6).